Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c2aaa3495ecc5b658fa6b624eb5929e68edcec4c321488c3bcef96300dd596' 
  AND token = 'ZDqQpnmEGHBV4VaESMTEMbMYsIxDTct9/uI3gY7TipI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}